Tom Swift and his Dyna-4 Capsule
By: by Victor Appleton II [pseudonym]; illustrated by Ray Johnson.
Contributors: Ray Johnson (Illustrator)
Series: Tom Swift Jr. #31
Publisher: Grosset & Dunlap Inc.
Published: 1969
Place of publication: New York, NY
Language: eng
Format: Hardcover
Number of pages: 175
Copyright date: 1969
Subjects: Swift, Tom (Fictitious character) -- Juvenile fiction.; Adventure and adventurers -- Juvenile fiction.; Science fiction -- Juvenile.; Underwater exploration -- Juvenile fiction.
Genres: Juvenile fiction.
Description: What are the green glowing bubble creatures that the young scientist-inventor encounters in the depths of the Pacific Ocean? How do they rescue Tom and his pal Bud Barclay from an attack by the fish men?

Tom's electrifying adventures begin deep in the Mariana Trench where he has based his newest invention, the Dyna-4 Capsule, in a hunt for rare metals. A super submarine, the craft has been especially designed for deep-sea research and exploration.

On orders from Washington, Tom takes time out from his own project to recover5 a stolen vial containing a highly destructive explosive. The top-secret mission turns into a danger-filled whale chase in the Dyna-4 and leads to a showdown with Tom's ruthless foes.